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The C1RadialMenu control can hold submenus. These submenus are created when C1RadialMenuItems are nested within the tags of other C1RadialMenuItems. For example, placing the following XAML markup
<c1:C1RadialMenuItem Header="First">
<c1:C1RadialMenuItem Header="Second">
<c1:C1RadialMenuItem Header="Third">
<c1:C1RadialMenuItem Header="Fourth">
<c1:C1RadialMenuItem Header="Fifth"/>
</c1:C1RadialMenuItem>
between the opening and closing tags of a C1RadialMenu would create the following:
You can have as many nested radial menus as you want, although it's best not to have more than two or three submenus in a hierarchy for usability purposes.